package org.apache.commons.graph.algorithms.flow

import org.apache.commons.graph.DirectedGraph
import org.apache.commons.graph.Mapper

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/

/**
 * TODO Fill me!!!
 *
 * @param <V> the Graph vertices type
 * @param <WE> the Graph edges type
 * @param <W> the Graph weight type
</W></WE></V> */
interface FromHeadBuilder<V, WE, W> {
    /**
     * TODO Fill me !!!
     * @param head
     * @return
     */
    fun <H : V> from(head: H): ToTailBuilder<V, WE, W>
}


/**
 * [FromHeadBuilder] implementation.
 *
 *
 * @param <V> the Graph vertices type
 * @param <WE> the Graph edges type
 * @param <W> the Graph weight type
</W></WE></V> */
internal class DefaultFromHeadBuilder<V, WE, W>(
    private val graph: DirectedGraph<V, WE>,
    private val weightedEdges: Mapper<WE, W>
) : FromHeadBuilder<V, WE, W> {
    override fun <H : V> from(head: H): ToTailBuilder<V, WE, W> {
        //var head = head
        //head = Assertions.checkNotNull(head, "head vertex has to be specifies when looking for the max flow")
        return org.apache.commons.graph.algorithms.flow.DefaultToTailBuilder(
            graph,
            weightedEdges,
            head
        )
    }
}
